Crosshead shoe



May 5, I931. T. w. DEMAREST 1,803,749

' CROSSHEAD SHOE .Filed Jan. 5, 1920 2 Sheets-Sheet l INVENTOR:

y 1931. T. w. DEMAREST 1,803,749

CROSSHEAD SHOE Filed Jan. 5, 1920 2 Sheets-Sheet 2 Patented May 5, 1931 THOMAS W. DEMAREST, OF PITTSBURGH, PENNSYLVANIA CROSSHEAD snon Application filed January 5, 1920. Serial No. 349,557.

My present invention relates in general to bearing blocks, and more particularly to the cross-heads of steam engines and has special reference to the provision of an improved type of cross-head employing i a separable shoe.

While I am aware thatit has heretofore been proposed so to construct the cross-heads in steam engine practice that the bearing surfaces of such cross-heads may from time to time be replaced, such structures as known to me are characterized by the fact that the relation of the cross-head body and its shoes 7 are purely contactual and therefore the strain of the retention of the shoes in position upon the body by which they are supported is borne largely by the bolts used to connect the body and shoes together, with the consequence that much care must be taken in inspection so as to make certain that the connecting bolts are kept tightened in order that the shoes may not become loose on the crosshead body with consequent tendency to undue or uneven wear, or shearing of such bolts, increasing the cost of maintenance, troubles in service, incidental delays and the frequency with which the shoes or bolts must be replaced.

. The principal objects, therefore, of my present invention are the provision of an improved bearing block of the character referred to which is so disposed relatively to the body which carries it and the surfaces against which it slides that improved means for fixing the, block relatively to the body may be employed; the provision of improved means for engagement of the block with the body; the provision of improved wedging means for fixing the block on the body; the, provision of improved means for preventing movement of the block relatively to the body; the provision of an improved arrangement of .inclinedsurfaceson the block and body whereby relative movement of block and body is prevented; the provision in an article of the character referred to characterized 5Q movement is prevented and furthermore one wherein the strainsjland stresses of service are borne mainly by the elements themselves rather than by the means employed for fixing them in relative position, together with such other and additional objects as may hereinafter appear.

In accomplishing the foregoing objects and gaining certain incidental advantages to be below pointed out, I have provided a construction of which one embodiment is illustrated in the accompanying drawings where- 5 1n:

Figure 1 is an elevational view,partlybroken away, illustrative of the application of my present invention to the cross-head of a steam engine; 1 Figure 2 is a plan view, partly in horizontal section of the cross-head of Figure 1;

Figure 3 is a transverse elevational view, partly in vertical section, taken on the line 3-3 of Figure l;

Figure 4: is a side elevational view, partly broken away, illustrative of one of the crosshead shoes shownin Figure 1, and

Figure 5 is atransverse elevational view, partly in vertical section, taken on the lines 5-75 of Figure 4.

Referring nowmore particularly to Figure l of the drawings, it will be observed that I have here illustrated the application of my present invention to a cross-head of the alligator type "which is one form employed in railway locomotive practice. In this structure, I employ a cross-head body 10, vertically disposed, which is provided on its upper and lower surfaces with removable shoes 11, 12 forming a structure which is supported by guides 13, 13, upon which it slides as the piston rodla, attached to the body 10 by the tapered key 14a, reciprocates in the cylinders of the-locomotive (not shown). 7

The blocks, 11 and 12 are alike in constructionand are of a generally U-form. They are each provided with aliner Behaving dovetailed engagement therewith as indicated at 13?), and are each provided with a transyerse slotted aperture 15 (see Figures 2 and 4) adapted to receive a bolt '16, threaded for the receptionof a nut 17 said bolt 16 passing therethrough and engaging a pair of oppositel-ydisposed ykey blocks 123 153? which hold the shoe in position on the cross-head body in a manner to be presently described.

As will be observed on viewing Figure 1 and comparing it with Figures l and 5, the outer surfaces 19 and 20 of the cross-head body 10 are inclined longitudinally relatively to the longitudinal axis of the device, and similarly the inner surfaces 21 and 22 of the shoes 11 and 12 are correspondingly inclined so that when the shoes 11 and 12 are assembled on the body 10, the bearing surfaces 23, 24: of the shoes are parallel to the bearing surfaces of the guides 13, 13; furthermore, that each of the surfaces 21, 21 of said shoes is inclined laterally as well as longitudinally, and that each of. said shoes is provided with lateral tongue-like projections 25, 25 engaging corresponding grooves 26, 26' formed in the body 10 of the cross-head, but that such tongue-and-groove connections lie in a plane parallel to the longitudinal axis of the device.

Inasmuch as the tongues 25 engage the grooves 26, vertical displacement of the shoe is prevented; inasmuch as the surfaces 21 of the shoe 11 are inclined transversely as well as longitudinally, canting or other lateral displacement of the shoe 11 relatively to the cross-head body 10 is prevented; and inasmuch as the grooves 26, engaged by the tongues 25, lie in one plane, here shown as parallel to the longitudinal axis of the device, while the surfaces 192l and 19 and 21', re spectively, are inclined relatively to such plane, viz: to. the longitudinal axis, movement of the shoe to the right of the position shown in Figure 1 is limited.

For fixing the shoe 11 on the body 10 in the position shown and preventing its movement to the left thereof, key blocks 18 are utilized. On viewing Figure 2, it will be observed that th right-hand terminal of the shoe is provided with dove-tail surfaces 27, 27 angularly disposed relatively to each other; that the key blocks 18 are given correspondingly tapered form with surfaces 28, 28 adapted to contact with such surfaces 27, 27 and that such blocks 18 abut a gainst the cross-head body 10 at the oppositely disposed points thereof 29, 29. By this construction, any movement of the shoe to the left of the position shown in the drawing is prevented when the bolt 16 is passed through said blocks 18 and through the slotted aperture 15 in the shoe 11 and the nut 1'? is drawn up into the position shown thereon. Such forms and numbers of washers, 17a, as may be desired are used and the nut 17 may be castellated and held in position by a cotter-pin 17?).

From the foregoing description, it will be observed that not only are the shoes readily installed and held in position, but also that they may be readily removed for repair or replacement. Furthermore, that the structure permits the use of shoes finished only on their bearingsurfaces since such shoes may be readily brought into position by drawing in the key blocks 18, 18.

Another most important feature of the invention resides in the fact that by virtue of the relation of the surfaces 27 and 28, 27 and 28', and the employment of slotted aperture 15, practically no sh caring strains on the bolt, 16, can arise, such strains as are transmitted to the bolt being borne substantially longitudinally thereof.

Another advantage of structures embodying my presentinvention is that the shoes may be removed and replaced without changing the relative position of the cross-head and guides, since such shoes may be removed longitudinally relatively to the cross-head, without disturbance thereof or interference by the guides, inasmuch as the bolt 16 and key blocks 18, 18 are removed laterally.

Having thus described my invention and illustrated its use, what I claim as new and desireto secure by Letters Patent is:

1. A device of the character described, comprising, in combination, a body and a shoe provided with means for interlocking the body and shoe together, said body and shoe each being further provided with co-operating inclined contacting surfaces which limit relative movement of the shoe and body in one direction, and said interlocking means being adapted for holding said body and shoe in predetermined relative position.

2. A. device of the character described, comprising, in combination, a body and a shoe provided with means for interlocking the body and shoe together, said body and shoe each being further provided with co-operating longitudinally inclined contacting surfaces which limit relative movement of the shoe and body in one direction and said interlocking means being adapted for holding said body and shoe in predetermined relative position.

3. A device of the character described, in combination, a body and a shoe, said body and shoe having tapered longitudinal dove-tail tongue and groove engagement arranged to form the sole means for preventing longitudinal. movement in one direction only of said body and shoe.

4. A device of the character described, comprising, in combination, a body and a. shoe, said body and shoe having tongue-and-groove engagement and wedging means for preventing relative movement therebetwecn.

5. A device of the character described comprising, in combination, a body and a shoe, said body and shoe having dove-tailed engagement constructed for preventing relative longitudinal movement therebetween in one direction.

6. A device of the character described, comprising. in combination, a body and a shoe, said body and shoe having tongue-and-groovc engagement, co-operating contacting surfaces inclined relatively to said tong'ue-and-groove engagement, and auxiliary wedging means for preventing relative movement therebetween. 1 V 7. A device of the character described, comprising, in Combination, a body and. a shoe, said body and shoe having tongue-and-groove engagment, cobperating contacting surfaces inclined relatively to said tongue-and-groove engagement, and means, including apair of wedging members acting on opposite sides of said shoe and body, for preventing relative movement therebetween. 1

8. A device of the character described, comprising, in combination, a body and a shoe having tongue-and-groove engagement and co-operating contacting surfaces inclined relatively to said tongue-and-groove engagement whereby movement therebetween in one direction may be prevented, and a key block actlng on said body and shoe,said key block and shoe being provided with co-operating wedging surfaces whereby movement between the body and shoe in the opposite direction may be prevented.

9. A device of the character described, comprising, in combination, a body and a shoe having tongue-and-groove engagement and co-operating contacting surfaces inclined relativelyto said tongue-and-groove engagement whereby movement therebetween in one direction may be prevented, and a key block acting on said body and shoe, said key block and shoe being provided with co-operating wedging surfaces whereby movement between the body and shoe in the opposite direction may be prevented, and means for preventing movement between the key block and the shoe.

10. A device of the character described, comprising, in combination, a body and a shoe having tongue-and-groove engagement and co-operating contacting surfaces inclined relatively to said tongue-and-groove engagement whereby movement therebetween in one direction may be prevented, and a pair of key blocks acting on said body and shoe at opposite sides thereof, said key blocks and shoe being provided with co-operating wedging surfaces whereby movement between the body and shoe in the opposite direction may be prevented. 1 Y

11. A device of the character described, comprising, in combination, abody and a shoe having tongue-and groove' engagement and cooperating contacting surfaces inclined relatively to said tongue-and-groove engagement, both longitudinally and laterally, whereby movement therebetween in one direction may be prevented, and a key block acting on said body and shoe, said key block and'shoe being comprising, in combination, a body and a shoe having tongue-and-groove engagement and co-operating contacting surfaces inclined relatively 'to said tongue-and-groove engagement, both longitudinallyand laterally,

whereby movement therebetween in two di-' rections may be prevented, and a key block acting on said body and shoe, said key block and shoe being'p-rovided with co-operating wedging surfaces whereby movement between the body and shoe in a third direction may be prevented. g

18. A device of the character described,

comprising, in combination, a body and a shoe cooperating contacting surfaces inclined relatively to said tongue-and-groove engagement, both longitudinally and laterally, whereby movement therebetween in one direction may be prevented, key blocks acting on said body and shoe, said key blocks and shoe being provided with co-operating wedging surfaces, and registering apertures, one

of which is elongated, and a retaining member passing through said aperture for holding said key blocks against said body and shoe, whereby movement between the body and shoe in the opposite direction may be pre vented.

15. A device of the character described, comprising, in combination, a body and a shoe provided with integral means whereby they may be wedged together, and means for maintaining said wedged relationship between thebody and shoe. 7

16. A device of the character described,

comprising, in combination, a body and a shoe provided with primary means whereby they may be wedged together, and secondary means, including an auxiliary wedge, for maintaining said wedged relationship be: tween the body and shoe 'efiected by said primary means.

17. A device of the character described, comprising, in combination, a body and a shoe provided with means whereby theymay be connected together in wedged relationship, and wedge means for maintaining such conneotion. I V

'18. A device of the character described, comprising, in combination, an inter-locking.

body and shoe adapted for separation by relative movement substantially parallel to their longitudinal axis, and means disposed at an angle to said axis for preventing such relative movement, all so arranged that stresses on said preventing means are transmitted substantially longitudinally of said means.

19. A device of the character described, comprising, in combination, a body and a shoe having tongue-and-groove engagement and co-operating contacting surfaces inclined relatively to said tongue-and-groove engagement whereby movement therebetween in one direction may be prevented, key blocks acting on said body and shoe, said key blocks and shoe being provided with co-operating wedging surfaces, and registering apertures, one of which is elongated, and means passing through said aperture for drawing said key blocks against said body and shoe, and thereby moving said shoe relatively to said body as far as permitted by said tongue-and-groove engagement and inclined contacting surfaces.

20. A device of the character described comprising, in combination, a body and shoe having tapered longitudinal tongue and groove engagement forming means for preventing relative movement in one direction longitudinally, and also preventing vertical movement therebetween.

21. A device of the character described comprising, in combination, a body and shoe having tapered longitudinal dove-tailed engagement constructed and forming means for preventing relative longitudinal movement in one direction and vertical movement therebetween.

22. In a device of the character described, in combination, a body member and a shoe member provided with cooperating longitudinally inclined surfaces, and means integral with one of said members for cooperation with the other of said members and said inclined surfaces for preventing relative movement of said members in one direction only.

23. In an engine cross-head, in combination, a body reciprocable between guides, shoes slidable upon the opposite faces of the cross-head between the guides and body to a predetermined limit point on said body, and means at one end of said body forming the sole means for interlocking said shoes fixedly to the body.

24. A device of the character described comprising, in combination, a body and shoe having a longitudinal wedging engagement for preventing relative longitudinal move ment therebetween in one direction.

25. A device of the character described comprising, in combination, a body and shoe having a longitudinal wedging engagement for preventing relative longitudinal and vertical movement therebetween in one direction.

26. A device of the character described comprising, in combination, a body and a shoe having tongue and groove engagement for preventing relative vertical movement therebetween, co-operating contacting surfaces inclined longitudinally relatively to said tongue and groove engagement for preventing relative movement of said body and shoe in one direction, and means for preventing relative movement in the opposite direction.

27. A device of the character described comprising, in combination, a body and a shoe provided with means for connecting the body and shoe together including grooves formed in the body facing each other and projections carried by the shoe and entering said grooves, said body and shoe being further provided with longitudinally inclined co-operating surfaces.

28. In combination, a body having a longitudinal recess, a shoe on one side of said body, opposed grooves in the walls of said recess, longitudinal tongues on said shoe seating in said grooves, and the engaging surfaces of the body and shoe being inclined longitudinally relative to said tongues and grooves, and means on one end of said body having detachable engagement with one end of the shoe.

29. In combination, a body having longitudinally inclined faces, a shoe having a complementally arranged face contacting therewith and having means engaging the body to prevent relative longitudinal movement of said body and shoe in one direction, and means on one end of the shoe and body for preventing relative movement thereof in the opposite direction.

30. A device of the character described, comprising in combination, a body and a shoe, said body and shoe being provided with means integral therewith for producing a wedging engagement therebetween upon relative movement of the two in a longitudinal direction.

31. A device of the character described, comprising a body and a shoe, each being provided with a plurality of spaced surfaces converging longitudinally thereof, the corresponding surfaces of the two being in contact.

32. A device of the character described, in combination, a body and a shoe, said body and shoe having contacting inclined surfaces and a tongue and groove connection arrangement for preventing relative longitudinal movementin one direction therebetween.

83. A device of the character described, comprising in combination, a body and a shoe, said body and shoe being provided with means integral therewith for producing a wedging engagement therebetween to prevent relative movement of the two in one direction longitudinally of the body.

34. A device of the character described, comprising in combination, a body and a shoe, said body and shoe being provided with means integral therewith for producing an increasingly effective locking engagement therebetween to prevent relative movement of the two in one direction longitudinally of the body.

35. A device of the character described,

comprising in combination, a body and a shoe, said body and shoe being provided with means integral therewith for producing a frictional engagement therebetween to prevent relative movement of the two in one direction longitudinally of the body.

In testimony whereof I have hereunto signed my name.

THOMAS W. DEMAREST. 

